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Surface Water Summary. Flow values from NPDES ponds were below average <br />this year at Ponds 005 and 009. Flow values from NPDES ponds were above <br />average this year at all other ponds. TDS values at NPDES sites 006 and <br />017 are increasing, as are TDS values at all three downstream surface <br />water sites (WSHF1, WSD5, and WSSF3) and Spoil Spring 3. The TDS trend <br />is decreasing at Ponds 005, 009 and 015 and Spoil Springs 2 and 4. The <br />TDS trend is stable at Pond 016 and Spoil Spring 1. NPDES discharges are <br />normally suitable for livestock and irrigation, but sometimes exceed <br />water quality standards for aquatic life. All surface water sites, <br />except for lower Sage Creek (WSSF3), had TDS values below the PHC <br />predictions. <br />American Public Health Association (Ed.) 1985. "Standard Methods for <br />the Examination of Water and Wastewater", 16th Edition, Washington, D.C. <br />Brakensieh and others. 1979. "Field Manual for Research in Agricultural <br />Hydrology". <br />Buchanan and Sumers. 1968. "Stage Measurements at Gaging Stations" <br />Colorado Dept. of Health. August 2005. "Regulation No. 31, The Basic <br />Standards and Methodologies for Surface Water" <br />Colorado Dept. of Health. December 2005. "Regulation No. 33, <br />Classification and Numeric Standards for the Upper Colorado River Basin" <br />Colorado Dept. of Health. November 2004. "Regulation No. 41, The Basic <br />Standards for Ground Water" <br />EPA. 1976. "Quality Criteria for Water" <br />Hem, John D. 1989. "Study and Interpretation of the Chemical <br />Characteristics of Natural Water" USGS Water Supply Paper 2254, Third <br />Edition <br />?3 <br />